"It was so bad for me, actually, I was convinced that I was, like, maybe birthing a vampire baby like the one from Twilight," she added. "You know what happens to Bella, where she's in cold sweats all the time? I felt like that was happening because I had no vitamins and nutrients and I was just nauseous."

Fortunately for Fox, the rest of of her pregnancy was "perfect."

Meanwhile, her other baby, the new movie This Is 40, hits theaters on Friday.